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Schedule of Fair Value of Senior Notes (Parenthetical) (Detail)
9 Months Ended 12 Months Ended
Sep. 15, 2016
Sep. 24, 2016
Dec. 26, 2015
9.75% senior secured notes, due 2019      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate 9.75%    
Long-term debt, due date 2019    
9.75% senior secured notes, due 2019 | Recourse Debt | Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate   9.75% 9.75%
Long-term debt, due date   2019 2019
9.75% senior secured notes, due 2019 | Recourse Debt | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate   9.75% 9.75%
Long-term debt, due date   2019 2019
7.35% debentures, due 2016 | Recourse Debt | Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate   7.35% 7.35%
Long-term debt, due date   2016 2016
7.35% debentures, due 2016 | Recourse Debt | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate   7.35% 7.35%
Long-term debt, due date   2016 2016
Revenue bonds, due in varying amounts periodically through 2029 | Recourse Debt | Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, due date   2029 2029
Revenue bonds, due in varying amounts periodically through 2029 | Recourse Debt | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, due date   2029 2029
American & Foreign Power Company, Inc. 5% debentures, due 2030 | Recourse Debt | Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate   5.00% 5.00%
Long-term debt, due date   2030 2030
American & Foreign Power Company, Inc. 5% debentures, due 2030 | Recourse Debt | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate   5.00% 5.00%
Long-term debt, due date   2030 2030